Yes I will jailbreak it to get KUAL and KOreader. Thanks kovid and open source.
It’s open source software that lets you read epubs and cbz files natively without conversions, bypass Amazon’s “Send to Kindle” feature, and came at a time when Amazon was removing books from people’s devices. Koreader also has Calibre plugin support to transfer books that way as well (though this isn’t something I haven’t set up just yet).
Overall it provides a bit more granular control over your devices if you like to tinker, and provides an extended lifeline for devices Amazon may have stopped supporting.